Preliminary finding about sugar composition and organic acid structure of woodland grape (Vitis sylvestris GMEL.)
Keywords:
minerals, sugars, organic acids, woodland grapeAbstract
In this study, a total of 6 Vitis sylvestris GMEL. genotypes were compared to cultivated grapes of Vitis vinifera L. i.e. their sugar composition and acid structure were measured by HPLC (High Performance Liquid Chromatography) and AAS (Atomic Absorption Spectroscopy) in two different years (2014 and 2015). The predominant sugars in Vitis sylvestris GMEL. and Vitis vinifera L. (Welschriesling and Pinot noir) berries were glucose and fructose. Considering the total acid content of woodland grape berries, the amount of tartaric acid was lower than the amount of malic acid, in both years. Succinic acid was found in some Vitis sylvestris GMEL. genotypes (in 2014), which was absent from control European grapevine cultivars. Element analysis examinations by AAS indicated a higher concentration of potassium in the total mineral content of woodland grapes, than of other minerals. The preliminary results of this study pointed out interesting differences in the constitution of organic acids, sugar and mineral element content of the grape-juice of Vitis sylvestris GMEL. genotypes and Vitis vinifera L. cultivars.
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